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适合低渗透砂岩油层的新型磺基甜菜碱表面活性剂的研究

期刊名称：油田化学，2008，（03）
时间：0
分类：O647.2[理学—物理化学;理学—化学] TE357.46[石油与天然气工程—油气田开发工程]
作者机构：[1]教育部提高油气采收率重点实验室（大庆石油学院）,黑龙江大庆163318, [2]中国石油勘探开发研究院,北京100083
相关基金：国家自然科学基金重点项目“低渗透油层提高驱油效率的机理研究”（项目编号50634020）,黑龙江省杰出青年科学基金“油层多孔介质内纳观渗流界面作用力研究”.
相关项目：低渗透油层提高驱油效率的机理研究

关键词：磺基甜菜碱, 驱油表面活性驱, 超低界面张力体系, 磺基甜菜碱/聚合物复合体系, 注入性, 驱油效率, 非均质人造岩心, 低渗透砂岩油藏, 大庆油田, sulfobetaine, surfactant for EOR , utralow interfacial tension systems, sulfobelaine/polymer combinational flooding system, injectivity , oil displacement capability, heterogeneous artificial cores, low permeability sandstone oil reservoirs , Daqing oil fields

中文摘要：

报道了以中部有芳环的长链烷基为亲油基的一种新的驱油用磺基甜菜碱SLB-13，给出了化学结构，讨论了亲油基最佳结构。45℃时该表面活性剂水溶液在0．05～3．0g／L宽浓度范围可产生超低（10^-3mN／m）油水界面张力。在尺寸4．5×4．5×3．0（cm）、纵向渗透率变异系数0．72、平均渗透率29×10^-3～45×10^-3μm^2的石英砂胶结岩心上，使用黏度10mPa·s的模拟油，在45℃考察了水驱之后注入0．3PV化学剂段塞提高采收率的幅度及段塞注入性和提高波及体积能力（通过Ps／Pw值即注剂注水最大压差比），结果如下。1．0和3．0（g／L）SLB-13段塞仅提高采收率4．62％和3．41％，Ps／Pw值为0．37和0．43，注入性好但不能提高波及体积；0．4HPAM（M=4．8×10^6）段塞提高采收率7．22％，Ps／Pw=1．05；3．0＋0．4、1．0＋0．4、1．0＋0．8SLB-13＋HPAM复合段塞分别提高采收率8．68％、11．74％、16．20％，Ps／Pw值分别为1．04、1．37、2．30，最佳段塞为1．0＋0．4S阻13＋HPAM。SLB-13可用于大庆低渗油藏提高采收率。表3参6。

英文摘要：

A new sulfobetaine as sufactant for EOR having lipophilic long-chain alkyl with aromatic ring in middle position is presented and notated as SLB-13. Its chemical structure is given and optimal chemical structures of lipophilic groups are discussed. Aqueous SLB-13 solution creates ultralow water/oil interracial tension of magnititude 10.3 mN/m in a wide concentration range 0.05--3.0 g/ L at 45℃. On epoxy cemented quartz cores 4.5 × 4.5 ×3.0 （cm）, of average permeability 29 × 10^-3 --45 × 10^-3 μm2 and vertical permeability variation coefficient 0.72 and with a simulation oil of viscosity 10 mPa.s used, the enhancement in oil recovery （EiOR） by various chemical slugs in size 0.3 PV and their injectivity and sweeping efficiency in terms of injection pressure ratio of chemical slug to water, Ps/Pw, are investigated at 45℃ after the water flood phased ended and following results are obtained. An EiOR of 4.62% and 3.41% is obtained with 1.0 and 3.0 （g/L） SLB-13 slugs, which are easily injectable but have poor sweeping power as shown by Ps/Pw ratio 0.37 and 0.43. An EiOR of 7.22% and Ps/Pw ratio of 1.05 are obtained with 0.4 HPAM （of M = 4.8 × 10^6） slug. 3.0＋0.4,1.0＋0.4, and 1.0＋0.8 combinational SLB-13 ＋ HPAM slugs give EiOR of 8.68% ,11.74%, and 16.20% and Ps/Pw ratio of 1.04, 1.37, and 2.30, respectively. The optimal and proper slug appears to be 1.0 ＋ 0.4 SLB-13 ＋ HPAM. Thus, SLB-13 can be used as surfactant for EOR in low permeability sandstone reservoirs in Daqing.

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